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CVE-2020-20949

5.9 · MEDIUM

Bleichenbacher's attack on PKCS #1 v1.5 padding for RSA in STM32 cryptographic firmware library software expansion for STM32Cube (UM1924).

Published Jan 20, 2021CWE-327EPSS 0.94%

Overview

CVE-2020-20949 is a medium-severity vulnerability. It was published on January 20, 2021 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Bleichenbacher's attack on PKCS #1 v1.5 padding for RSA in STM32 cryptographic firmware library software expansion for STM32Cube (UM1924). The vulnerability can allow one to use Bleichenbacher's oracle attack to decrypt an encrypted ciphertext by making successive queries to the server using the vulnerable library, resulting in remote information disclosure.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refarchiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdfRefbi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bbRefwww.st.com/en/embedded-software/x-cube-cryptolib.htmlRefarchiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdfRefbi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bbRefwww.st.com/en/embedded-software/x-cube-cryptolib.html

How CyberStrike helps

Frequently asked questions

What is CVE-2020-20949?

CVE-2020-20949 is a medium-severity vulnerability. It was published on January 20, 2021 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2020-20949?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-20949?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-20949?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-20949 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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